Overboosting / spiking between gear shifts
HI all,
Just wanting to pick peoples brains over an issue i've been trying to sort for awhile. I have an fg mk1, 12psi actuator on a gt3576 with 37mm port, 4inch dump and high flow cat with a full exhaust. For a long time now i've been trying to tune out 'overboosting or boost spikes' on gear changes , mainly 1-2 and 2-3, with varying success. I'm running 16psi to 4750 which tapers down to 10psi at 6000rpm. By doing this i've managed to keep the spike between gears to about 18.5-20psi.
Rolls i could kiss you
As you suggested auF2714- Calibrateable wastegate duty cycle when gear change is in progress did not help, boost spike was still prevalent and boost cut kicked in same as before.
However change the auF3002 - Change in spark adder to wastegate duty cycle, which i read as doing the opposite (changes spark based on WG), FIXED EVERYTHING . I modified the the larger changes( 10-20deg delta) to -70% wastegate and now it actually changes the wastegate during the ge
